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<title>Problem 1740. -- [Usaco2005 mar]Yogurt factory -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1740: [Usaco2005 mar]Yogurt factory</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>47&nbsp;&nbsp;<span class=green>Solved: </span>38<br>[<a href='submitpage.php?id=1740'>Submit</a>][<a href='problemstatus.php?id=1740'>Status</a>][<a href='bbs.php?id=1740'>Discuss</a>]</center><h2>Description</h2><div class=content>
The cows have purchased a yogurt factory that makes world-famous
Yucky Yogurt. Over the next N (1 <= N <= 10,000) weeks, the price
of milk and labor will fluctuate weekly such that it will cost the
company C_i (1 <= C_i <= 5,000) cents to produce one unit of yogurt
in week i.  Yucky's factory, being well-designed, can produce arbitrarily
many units of yogurt each week.

Yucky Yogurt owns a warehouse that can store unused yogurt at a
constant fee of S (1 <= S <= 100) cents per unit of yogurt per week.
Fortuitously, yogurt does not spoil.  Yucky Yogurt's warehouse is enormous,
so it can hold arbitrarily many units of yogurt.

Yucky wants to find a way to make weekly deliveries of Y_i (0 <=
Y_i <= 10,000) units of yogurt to its clientele (Y_i is the delivery
quantity in week i). Help Yucky minimize its costs over the entire
N-week period. Yogurt produced in week i, as well as any yogurt
already in storage, can be used to meet Yucky's demand for that
week.

</div><h2>Input</h2><div class=content>
* Line 1: Two space-separated integers, N and S.

* Lines 2..N+1: Line i+1 contains two space-separated integers: C_i
        and Y_i.

</div><h2>Output</h2><div class=content>
* Line 1: Line 1 contains a single integer: the minimum total cost to
        satisfy the yogurt schedule.  Note that the total might be too
        large for a 32-bit integer.

</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata><br />
4 5<br />
88 200<br />
89 400<br />
97 300<br />
91 500<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
126900<br />
<br />
OUTPUT DETAILS:<br />
<br />
In week 1, produce 200 units of yogurt and deliver all of it. In<br />
week 2, produce 700 units: deliver 400 units while storing 300<br />
units. In week 3, deliver the 300 units that were stored. In week<br />
4, produce and deliver 500 units.</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Gold'>Gold</a></p></div><center>[<a href='submitpage.php?id=1740'>Submit</a>][<a href='problemstatus.php?id=1740'>Status</a>][<a href='bbs.php?id=1740'>Discuss</a>]</center>﻿<br>

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